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Amplitude Dependent Internal Friction within a Continuum Simulation

Published online by Cambridge University Press:  15 February 2011

P. Alex Greaney and
D. C. Chrzan
P. Alex Greaney
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720 and Materials Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA, 94720
D. C. Chrzan
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720 and Materials Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA, 94720
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Abstract

The mechanical losses due to the bowing of isolated Frank-Read sources under application of periodic loads is studied within a continuum simulation of dislocation dynamics. The dislocations are modelled within isotropic elasticity theory and assumed to be in the overdamped limit. Dislocation radiation effects are neglected. The mechanical losses are studied as a function of bias stress, amplitude of the periodic stress and frequency. The frequencies studied lie between 10 KHz and 1 MHz. Under high stresses applied at low frequencies, a deviation from the expected Lorentzian resonance shape is observed. The physical origins of this deviation are discussed.

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References

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